80891 ÷ 9 = 8987 R8
We're going to perform division on 80891 with 9 as the divisor.

Step 1:
9 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 8 to get 8.
Bring next digit (0) of the dividend behind the 8 and repeat the process: 80 / 9

Step 2:
9 goes into 80 8 times with a remainder of 8.
Write down 8 as next digit of of the result. 
Result so far: 8
Subtract 72 from 80 to get 8.
Bring next digit (8) of the dividend behind the 8 and repeat the process: 88 / 9

Step 3:
9 goes into 88 9 times with a remainder of 7.
Write down 9 as next digit of of the result. 
Result so far: 89
Subtract 81 from 88 to get 7.
Bring next digit (9) of the dividend behind the 7 and repeat the process: 79 / 9

Step 4:
9 goes into 79 8 times with a remainder of 7.
Write down 8 as next digit of of the result. 
Result so far: 898
Subtract 72 from 79 to get 7.
Bring next digit (1) of the dividend behind the 7 and repeat the process: 71 / 9

Step 5:
9 goes into 71 7 times with a remainder of 8.
Write down 7 as next digit of of the result. 
Result so far: 8987
Subtract 63 from 71 to get 8.

The final result is 8987 with a remainder of 8.